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Intermediate image of three-mirror anastigmat having two image surfaces was between secondary and tertiary mirror. In order to fold the optical path, four-mirror anastigmat was designed by adding the spherical reflective mirror at intermediate image.

带一次中间像面的离轴三反系统的中间像位于次镜和三镜之间,为了进一步折叠光路,在中间像面处加入球面反射场镜,从而成为离轴四反。

The unsaturated and compacted soil triaxial test result under constant suction describes the unsaturated soil critical state surface in p-q-s three dimensional space: in p - q plane, the slope M of critical state line is independent of suction; the cross line of LC yield surface and critical state surface is a curve with extremum in three dimensional stress space, and its projection in p-s plane is located in quadrant 1 in triaxial compression state; its projection in q-s plane has asymptote, and there should also be asymptote in respect of the curve that stands for the function relationship between cohesive and suction.

基于局部变形测量的常吸力非饱和压实土三轴剪切试验结果,全面描述了非饱和土p—g—s三维应力空间中临界状态面的合理形态:在p—q平面,临界状态线斜率M是与吸力无关的物理量;临界状态面与LC屈服面交线在三维应力空间中是一条存在极值的曲线;该交线在p—s平面的投影曲线在三轴压缩应力状态下应位于第一象限;该交线在q—s平面的投影曲线应存在渐近线;反映凝聚力与吸力关系的函数曲线也应存在渐近线。

This paper deals with the aberrations of optical systems consisting of cylindrical components with their axes, parallal and having a common axis of symmetry.

本文首先由柱面系统中描写光线所须的参数和对称性,确定了同轴柱面系统的独立象差数是八个,而对无限远物体而言则只有六个。

An improvement has been carried out on the generation method of 2D engineering drawing from 3D model in AutoCAD, and formed an intact methodology and skill of generating axonometric drawing and multi-planed orthogonal projection drawing from 3D model.

对AutoCAD中由三维模型生成二维工程图的方法进行了改进,形成由三维模型生成轴测图和多面正投影图的完整方法和技巧,这种方法所得到的轴测图和正投影图,可以对其更加方便地进行各种编辑,是一种适用的方

14Th week after injury, the reorganization of labelled neurons' distribution was found in the autograft group, but only one case in the NTN/PGLA group. Conclusion Local application of PGLA tube with neurturin can recover the axoplasm flow of regenerated nerve fibers, its long-term effect can match that of the nerve autograft, and collateral axonal branching occurred less.

应用NTN/PGLA导管的修复能够和自体神经移植修复一样恢复神经缺损的连续性和逆行轴浆运输功能,后期效果相当;应用NTN/PGLA导管修复后神经元分布异位明显少于自体神经移植修复,提示较少发生轴突误向再生,减少面肌联带运动的发生。

Finally, the results of aberration comparison indicated ellipsoidal dome can be used in coaxial infrared optical system, and conical surface has unique advantages in off-axis system.

最后根据像差的比较结果,得出:椭球面整流罩适用于共轴光学系统中,圆锥面整流罩则在离轴系统中更有独特的优势。

The aftershock distribution was relatively centered and the major axis of the aftershock area was not clear.

余震分布较集中,极震区长轴方向与震源机制解中节面Ⅰ走向基本一致,因此,节面Ⅰ可能是这次地震的主破裂面。

Two pairs of chutes and holes on the cleaning base and the brushes form the double chute swing mechanisms by the connection of an axis and cause the brush to cling to the wall surface to clean by the friction feedback, thus achieving effective cleaning when walking error occurs and the pipe section changes, furthermore, the larger the friction on the wall surface is, the larger the forward pressure on the wall surface is, therefore, the dirtier the wall surface is, the higher the cleaning efficiency is.

清扫底座与刷子夹上的两对滑槽和孔通过轴的连接形成双滑槽摆动机构,并通过摩擦力反馈使得刷子能够紧贴壁面进行清洗,从而在出现行走误差和管道截面变化时都能够有效清洗,并且壁面摩擦力越大刷子作用在壁面上的正压力越大,因此壁面越脏时清扫效率越高。

The paper discusses the position relationship between the litter circles of torus and the section circle of sphere figured out the intersection of torus and sphere when the central axis of torus and sphere center in XOZ coordinate plane through coordinate transformation.

利用坐标变换使圆环中心轴与球心同在XOZ平面内,讨论了在该平面内圆环截圆与球圆的位置不相交、相切和相交时圆环面和球面的相交情况,并给出了判别圆环面、球面相交情况的流程图以及圆环面和球面相交实例。

This paper presents the Machining Tool geometry of the former flank, the main flank, flank, the main cutting edge, Under the cutting edge tip cutting plane, the main section, the former Kok, horn, wedge angle edge angle, pointed knife, the blade angle, vice horn, Under the Frontier concept, the concept of cutting consumption, and the general circumstances of their choice method for processing slender shaft. cast iron materials, aluminum, stainless steel, rubber materials, plexiglass material, cloth bakelite materials, high temperature alloys, aluminum-magnesium alloy, hardened steel, the typical trapezoidal thread, the thread Triangle, Speaking at the trapezoidal screw thread pitch of the Tool geometry of the selection methods and cutting the amount of cutting fluids reasonable choice.

本文介绍了在机械加工中车刀几何角度中的前刀面、主后刀面、后刀面、主切削刃、副切削刃刀尖切削平面、主截面、前角、后角、楔角主偏角、刀尖角、刃倾角、副后角、副前角的概念、切削用量的概念、以及一般情况下的它们的选择方法,进行加工细长轴、铸铁材料、铝合金、不锈钢、橡胶材料、有机玻璃材料、夹布胶木材料、高温合金、铝镁合金、淬火钢、典型梯形螺纹、三角螺纹、特在螺距的梯形螺纹等的车刀几何角度的选取方法切削用量及切削液的合理选择。

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I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像,后来回台湾,甚至去年在北京,居然也四处看见她的海报,才惊讶她的魅力之大。

Ah may dee:You are chinese living in a democratic country.

你是居住在民主国家的中国人吧。